Rhymes with RADIOACTIVITY

radioactivity

Definition of RADIOACTIVITY for Kids

: the giving off of rays of energy or particles by the breaking apart of atoms of certain elements (as uranium)

2

: the rays or particles that are given off when atoms break apart

Medical Dictionary

radioactivity

nounra·dio·ac·tiv·i·ty \-ak-ˈtiv-ət-ē\

pluralra·dio·ac·tiv·i·ties

Medical Definition of RADIOACTIVITY

: the property possessed by some elements (as uranium) or isotopes (as carbon 14) of spontaneously emitting energetic particles (as electrons or alpha particles) by the disintegration of their atomic nuclei